An Aberrant Strain of the Bacterial Fish Pathogen Aeromonas salmonicida Isolated from a Marine Host, the Sablefish (Anoplopoma fimbria), and from Two Species of Cultured Pacific Salmon

1971 ◽  
Vol 28 (10) ◽  
pp. 1629-1634 ◽  
Author(s):  
T. P. T. Evelyn
Keyword(s):  
Marine Fish ◽  
Brackish Water ◽  
Pacific Salmon ◽  
Oncorhynchus Nerka ◽  
Aeromonas Salmonicida ◽  
Oncorhynchus Keta ◽  
Fish Pathogen ◽  
Anoplopoma Fimbria ◽  
Diseased Fish ◽  
Causative Bacterium

Biochemically unique strains of the causative bacterium (Aeromonas salmonicida) of furunculosis in fish are described. The strains were first isolated from a marine host, the sablefish, Anoplopoma fimbria, and later, from sockeye (Oncorhynchus nerka) and chum (Oncorhynchus keta) salmon. The strains were essentially identical, and although always isolated from diseased fish cultured in sea or brackish water, they behaved like typical freshwater bacteria.The outbreaks of furunculosis in local fish-culture facilities were rare events that are thought to have resulted from import of the pathogen in wild carrier fish. In the case of the sablefish that was captured at sea shortly before its death, the infection appears to represent the first instance of spontaneous furunculosis in a marine fish.

Kudoa thyrsites (Gilchrist, 1924) (Myxozoa) in the cardiac muscle of Pacific salmon (Oncorhynchus spp.) and steelhead trout (Salmo gairdneri)

1989 ◽  
Vol 67 (2) ◽  
pp. 341-342 ◽  
Author(s):  
Z. Kabata ◽  
D. J. Whitaker
Keyword(s):  
British Columbia ◽  
Cardiac Muscle ◽  
Pacific Salmon ◽  
Oncorhynchus Nerka ◽  
Salmo Gairdneri ◽  
Oncorhynchus Keta ◽  
Steelhead Trout ◽  
Myxozoan Parasite ◽  
Kudoa Thyrsites ◽  
Pacific Salmonids

An examination of the cardiac muscle of returning adults of all species of British Columbia Pacific salmonids, including steelhead trout (Salmo gairdneri), for infection by the myxozoan parasite Kudoa thyrsites showed that all species but chum (Oncorhynchus keta) and sockeye (Oncorhynchus nerka) are susceptible to infection. The prevalence of observed infection was low. Its intensity was not determined, but the small numbers of spores observed suggest that it was low. The possible causes of these observations are discussed.

AsaGEI2d: a new variant of a genomic island identified in a group of Aeromonas salmonicida subsp. salmonicida isolated from France, which bears the pAsa7 plasmid

2021 ◽  
Author(s):  
Antony T Vincent ◽  
Laurent Intertaglia ◽  
Victor Loyer ◽  
Valérie E Paquet ◽  
Émilie Adouane ◽  
...  
Keyword(s):  
Genomic Island ◽  
Insertion Site ◽  
Aeromonas Salmonicida ◽  
Genomic Islands ◽  
The Other ◽  
Fish Pathogen ◽  
Integrase Gene ◽  
New Variant ◽  
Cat Gene ◽  
Unique Genes

Abstract Genomic islands (Aeromonas salmonicida genomic islands, AsaGEIs) are found worldwide in many isolates of Aeromonas salmonicida subsp. salmonicida, a fish pathogen. To date, five variants of AsaGEI (1a, 1b, 2a, 2b and 2c) have been described. Here, we investigate a sixth AsaGEI, which was identified in France between 2016 and 2019 in 20 A. salmonicida subsp. salmonicida isolates recovered from sick salmon all at the same location. This new AsaGEI shares the same insertion site in the chromosome as the other AsaGEI2s as they all have a homologous integrase gene. This new AsaGEI was thus named AsaGEI2d, and has 5 unique genes compared to the other AsaGEIs. The isolates carrying AsaGEI2d also bear the plasmid pAsa7, which was initially found in an isolate from Switzerland. This plasmid provides resistance to chloramphenicol thanks to a cat gene. This study reveals more about the diversity of the AsaGEIs.

Differential effects of turbidity on prey consumption of piscivorous and planktivorous fish

2003 ◽  
Vol 60 (12) ◽  
pp. 1517-1526 ◽  
Author(s):  
Alex De Robertis ◽  
Clifford H Ryer ◽  
Adriana Veloza ◽  
Richard D Brodeur
Keyword(s):  
Light Intensity ◽  
Prey Capture ◽  
High Light Intensity ◽  
Prey Consumption ◽  
Planktivorous Fish ◽  
Oncorhynchus Keta ◽  
Feeding Rates ◽  
Anoplopoma Fimbria ◽  
Piscivorous Fish ◽  
Feeding Experiments

Contrast degradation theory predicts that increased turbidity decreases the visibility of objects that are visible at longer distances more than that of objects that are visible at short distances. Consequently, turbidity should disproportionately decrease feeding rates by piscivorous fish, which feed on larger and more visible prey than particle-feeding planktivorous fish. We tested this prediction in a series of laboratory feeding experiments, the results of which indicated that prey consumption by two species of planktivorous fish (juvenile chum salmon (Oncorhynchus keta) and walleye pollock (Theragra chalcogramma)) is much less sensitive to elevated turbidity than piscivorous feeding by sablefish (Anoplopoma fimbria). Planktivorous feeding in the turbidity range tested (0–40 nephelometric turbidity units (NTU)) was reduced at high light intensity, but not at low light intensity. Comparatively low (5–10 NTU) turbidity decreased both the rate at which sablefish pursued prey and the probability of successful prey capture. These results suggest that turbid environments may be advantageous for planktivorous fish because they will be less vulnerable to predation by piscivores, but will not experience a substantial decrease in their ability to capture zooplankton prey.

scholarly journals Molecular Basis of Sulfonamide and Trimethoprim Resistance in Fish-Pathogenic Aeromonas Isolates

2011 ◽  
Vol 77 (20) ◽  
pp. 7147-7150 ◽  
Author(s):  
Kristina Kadlec ◽  
Ellen von Czapiewski ◽  
Heike Kaspar ◽  
Jürgen Wallmann ◽  
Geovana Brenner Michael ◽  
...  
Keyword(s):  
Resistance Genes ◽  
Molecular Basis ◽  
Aeromonas Salmonicida ◽  
The Novel ◽  
Content Type ◽  
Gene Cassettes ◽  
Class 1 Integrons ◽  
Novel Gene ◽  
Class 1 ◽  
Diseased Fish

ABSTRACTSulfonamide-trimethoprim-resistantAeromonas salmonicidaand motileAeromonasspp. from diseased fish of the GERM-Vet study carried thesul1gene together with mostly cassette-borne trimethoprim resistance genes, including the novel genedfrA28. The sevendfrAanddfrBgenes identified were located mostly in class 1 integrons which commonly harbored other gene cassettes.

scholarly journals Functional Tn5393-Like Transposon in the R Plasmid pRAS2 from the Fish Pathogen Aeromonas salmonicida subspecies salmonicida Isolated in Norway

2000 ◽  
Vol 66 (12) ◽  
pp. 5533-5535 ◽  
Author(s):  
Trine M. L'Ab�e-Lund ◽  
Henning S�rum
Keyword(s):  
Ecological Niche ◽  
Aeromonas Salmonicida ◽  
Fish Pathogen ◽  
Agricultural Habitat ◽  
First Time

ABSTRACT Tn5393c containing strA-strB was identified as part of R plasmid pRAS2 from the fish pathogen Aeromonas salmonicida subsp. salmonicida. This is the first time an intact and active transposon in the Tn5393 family has been reported in an ecological niche other than an agricultural habitat.

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